A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 1, CLEMONS, IA 50051-0001
PO BOX 2, CLEMONS, IA 50051-0002
PO BOX 3, CLEMONS, IA 50051-0003
PO BOX 4, CLEMONS, IA 50051-0004
PO BOX 5, CLEMONS, IA 50051-0005
PO BOX 6, CLEMONS, IA 50051-0006
PO BOX 7, CLEMONS, IA 50051-0007
PO BOX 8, CLEMONS, IA 50051-0008
PO BOX 9, CLEMONS, IA 50051-0009
PO BOX 10, CLEMONS, IA 50051-0010
PO BOX 11, CLEMONS, IA 50051-0011
PO BOX 12, CLEMONS, IA 50051-0012
PO BOX 13, CLEMONS, IA 50051-0013
PO BOX 14, CLEMONS, IA 50051-0014
PO BOX 15, CLEMONS, IA 50051-0015
PO BOX 16, CLEMONS, IA 50051-0016
PO BOX 17, CLEMONS, IA 50051-0017
PO BOX 18, CLEMONS, IA 50051-0018
PO BOX 19, CLEMONS, IA 50051-0019
PO BOX 20, CLEMONS, IA 50051-0020
PO BOX 21, CLEMONS, IA 50051-0021
PO BOX 22, CLEMONS, IA 50051-0022
PO BOX 23, CLEMONS, IA 50051-0023
PO BOX 24, CLEMONS, IA 50051-0024
PO BOX 25, CLEMONS, IA 50051-0025
PO BOX 26, CLEMONS, IA 50051-0026
PO BOX 27, CLEMONS, IA 50051-0027
PO BOX 28, CLEMONS, IA 50051-0028
PO BOX 29, CLEMONS, IA 50051-0029
PO BOX 30, CLEMONS, IA 50051-0030
PO BOX 31, CLEMONS, IA 50051-0031
PO BOX 32, CLEMONS, IA 50051-0032
PO BOX 33, CLEMONS, IA 50051-0033
PO BOX 34, CLEMONS, IA 50051-0034
PO BOX 35, CLEMONS, IA 50051-0035
PO BOX 36, CLEMONS, IA 50051-0036
PO BOX 37, CLEMONS, IA 50051-0037
PO BOX 38, CLEMONS, IA 50051-0038
PO BOX 39, CLEMONS, IA 50051-0039
PO BOX 40, CLEMONS, IA 50051-0040
PO BOX 41, CLEMONS, IA 50051-0041
PO BOX 42, CLEMONS, IA 50051-0042
PO BOX 43, CLEMONS, IA 50051-0043
PO BOX 44, CLEMONS, IA 50051-0044
PO BOX 45, CLEMONS, IA 50051-0045
PO BOX 46, CLEMONS, IA 50051-0046
PO BOX 47, CLEMONS, IA 50051-0047
PO BOX 48, CLEMONS, IA 50051-0048
PO BOX 49, CLEMONS, IA 50051-0049
PO BOX 50, CLEMONS, IA 50051-0050
PO BOX 51, CLEMONS, IA 50051-0051
PO BOX 52, CLEMONS, IA 50051-0052
PO BOX 53, CLEMONS, IA 50051-0053
PO BOX 54, CLEMONS, IA 50051-0054
PO BOX 55, CLEMONS, IA 50051-0055
PO BOX 56, CLEMONS, IA 50051-0056
PO BOX 57, CLEMONS, IA 50051-0057
PO BOX 58, CLEMONS, IA 50051-0058
PO BOX 59, CLEMONS, IA 50051-0059
PO BOX 60, CLEMONS, IA 50051-0060
PO BOX 61, CLEMONS, IA 50051-0061
PO BOX 62, CLEMONS, IA 50051-0062
PO BOX 63, CLEMONS, IA 50051-0063
PO BOX 64, CLEMONS, IA 50051-0064
PO BOX 65, CLEMONS, IA 50051-0065
PO BOX 66, CLEMONS, IA 50051-0066
PO BOX 67, CLEMONS, IA 50051-0067
PO BOX 68, CLEMONS, IA 50051-0068
PO BOX 69, CLEMONS, IA 50051-0069
PO BOX 70, CLEMONS, IA 50051-0070
PO BOX 71, CLEMONS, IA 50051-0071
PO BOX 72, CLEMONS, IA 50051-0072
PO BOX 73, CLEMONS, IA 50051-0073
PO BOX 74, CLEMONS, IA 50051-0074
PO BOX 75, CLEMONS, IA 50051-0075
PO BOX 76, CLEMONS, IA 50051-0076
PO BOX 77, CLEMONS, IA 50051-0077
PO BOX 78, CLEMONS, IA 50051-0078
PO BOX 79, CLEMONS, IA 50051-0079
PO BOX 80, CLEMONS, IA 50051-0080
PO BOX 81, CLEMONS, IA 50051-0081
PO BOX 82, CLEMONS, IA 50051-0082
PO BOX 83, CLEMONS, IA 50051-0083
PO BOX 84, CLEMONS, IA 50051-0084
PO BOX 85, CLEMONS, IA 50051-0085
PO BOX 86, CLEMONS, IA 50051-0086
PO BOX 87, CLEMONS, IA 50051-0087
PO BOX 88, CLEMONS, IA 50051-0088
PO BOX 89, CLEMONS, IA 50051-0089
PO BOX 90, CLEMONS, IA 50051-0090
PO BOX 91, CLEMONS, IA 50051-0091
PO BOX 92, CLEMONS, IA 50051-0092
PO BOX 93, CLEMONS, IA 50051-0093
PO BOX 94, CLEMONS, IA 50051-0094
PO BOX 95, CLEMONS, IA 50051-0095
PO BOX 96, CLEMONS, IA 50051-0096
PO BOX 97, CLEMONS, IA 50051-0097
PO BOX 98, CLEMONS, IA 50051-0098
PO BOX 99, CLEMONS, IA 50051-0099
PO BOX 100, CLEMONS, IA 50051-0100
PO BOX 101, CLEMONS, IA 50051-0101
PO BOX 102, CLEMONS, IA 50051-0102
PO BOX 103, CLEMONS, IA 50051-0103
PO BOX 104, CLEMONS, IA 50051-0104
PO BOX 105, CLEMONS, IA 50051-0105
PO BOX 106, CLEMONS, IA 50051-0106
PO BOX 107, CLEMONS, IA 50051-0107
PO BOX 108, CLEMONS, IA 50051-0108
PO BOX 109, CLEMONS, IA 50051-0109
PO BOX 110, CLEMONS, IA 50051-0110
PO BOX 111, CLEMONS, IA 50051-0111
PO BOX 112, CLEMONS, IA 50051-0112
PO BOX 113, CLEMONS, IA 50051-0113
PO BOX 114, CLEMONS, IA 50051-0114
PO BOX 115, CLEMONS, IA 50051-0115
PO BOX 116, CLEMONS, IA 50051-0116
PO BOX 117, CLEMONS, IA 50051-0117
PO BOX 118, CLEMONS, IA 50051-0118
PO BOX 119, CLEMONS, IA 50051-0119
PO BOX 120, CLEMONS, IA 50051-0120
PO BOX 121, CLEMONS, IA 50051-0121
PO BOX 122, CLEMONS, IA 50051-0122
PO BOX 123, CLEMONS, IA 50051-0123
PO BOX 124, CLEMONS, IA 50051-0124
PO BOX 125, CLEMONS, IA 50051-0125
PO BOX 126, CLEMONS, IA 50051-0126
PO BOX 127, CLEMONS, IA 50051-0127
PO BOX 128, CLEMONS, IA 50051-0128
PO BOX 129, CLEMONS, IA 50051-0129
PO BOX 130, CLEMONS, IA 50051-0130
PO BOX 131, CLEMONS, IA 50051-0131
PO BOX 132, CLEMONS, IA 50051-0132
PO BOX 133, CLEMONS, IA 50051-0133
PO BOX 134, CLEMONS, IA 50051-0134
PO BOX 135, CLEMONS, IA 50051-0135
PO BOX 136, CLEMONS, IA 50051-0136
PO BOX 137, CLEMONS, IA 50051-0137
PO BOX 138, CLEMONS, IA 50051-0138
PO BOX 139, CLEMONS, IA 50051-0139
PO BOX 140, CLEMONS, IA 50051-0140
PO BOX 141, CLEMONS, IA 50051-0141
PO BOX 142, CLEMONS, IA 50051-0142
PO BOX 143, CLEMONS, IA 50051-0143
PO BOX 144, CLEMONS, IA 50051-0144
PO BOX 145, CLEMONS, IA 50051-0145
PO BOX 146, CLEMONS, IA 50051-0146
PO BOX 147, CLEMONS, IA 50051-0147
PO BOX 148, CLEMONS, IA 50051-0148
PO BOX 149, CLEMONS, IA 50051-0149
PO BOX 150, CLEMONS, IA 50051-0150
PO BOX 151, CLEMONS, IA 50051-0151
PO BOX 152, CLEMONS, IA 50051-0152
PO BOX 153, CLEMONS, IA 50051-0153
PO BOX 154, CLEMONS, IA 50051-0154
PO BOX 155, CLEMONS, IA 50051-0155
PO BOX 156, CLEMONS, IA 50051-0156
PO BOX 157, CLEMONS, IA 50051-0157
PO BOX 158, CLEMONS, IA 50051-0158
PO BOX 159, CLEMONS, IA 50051-0159
PO BOX 160, CLEMONS, IA 50051-0160
PO BOX 161, CLEMONS, IA 50051-0161
PO BOX 162, CLEMONS, IA 50051-0162
PO BOX 163, CLEMONS, IA 50051-0163
PO BOX 164, CLEMONS, IA 50051-0164
PO BOX 165, CLEMONS, IA 50051-0165
PO BOX 166, CLEMONS, IA 50051-0166
PO BOX 167, CLEMONS, IA 50051-0167
PO BOX 168, CLEMONS, IA 50051-0168
PO BOX 169, CLEMONS, IA 50051-0169
PO BOX 170, CLEMONS, IA 50051-0170
PO BOX 171, CLEMONS, IA 50051-0171
PO BOX 172, CLEMONS, IA 50051-0172
PO BOX 173, CLEMONS, IA 50051-0173
PO BOX 174, CLEMONS, IA 50051-0174
PO BOX 175, CLEMONS, IA 50051-0175
PO BOX 176, CLEMONS, IA 50051-0176
PO BOX 177, CLEMONS, IA 50051-0177
PO BOX 178, CLEMONS, IA 50051-0178
PO BOX 179, CLEMONS, IA 50051-0179
PO BOX 180, CLEMONS, IA 50051-0180
PO BOX 181, CLEMONS, IA 50051-0181
PO BOX 182, CLEMONS, IA 50051-0182
PO BOX 183, CLEMONS, IA 50051-0183
PO BOX 184, CLEMONS, IA 50051-0184
PO BOX 185, CLEMONS, IA 50051-0185
PO BOX 186, CLEMONS, IA 50051-0186
PO BOX 187, CLEMONS, IA 50051-0187
PO BOX 188, CLEMONS, IA 50051-0188
PO BOX 189, CLEMONS, IA 50051-0189
PO BOX 190, CLEMONS, IA 50051-0190
PO BOX 191, CLEMONS, IA 50051-0191
PO BOX 192, CLEMONS, IA 50051-0192
PO BOX 193, CLEMONS, IA 50051-0193
PO BOX 194, CLEMONS, IA 50051-0194
PO BOX 195, CLEMONS, IA 50051-0195
PO BOX 196, CLEMONS, IA 50051-0196
PO BOX 197, CLEMONS, IA 50051-0197
PO BOX 198, CLEMONS, IA 50051-0198
PO BOX 199, CLEMONS, IA 50051-0199
PO BOX 200, CLEMONS, IA 50051-0200
PO BOX 201, CLEMONS, IA 50051-0201
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